#333F47
Closest named color: Onyx (#343A40). oklch(36% 0.021 237.4), rgb(51, 63, 71).
Aa
White text reads best on this color (10.80:1).
About this color
#333F47 is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.021. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.017 away. White text reads best on it, at 10.80:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.94:1 |
| White text | 10.80:1 |
Values
| HEX | #333F47 |
| RGB | rgb(51, 63, 71) |
| HSL | hsl(204, 16%, 24%) |
| OKLCH | oklch(36% 0.021 237.4) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #333F47 | 10.80:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #333F47 | 1.94:1 | Fails | Lc 8.9 | Not readable |
| #333F47 text on white | 10.80:1 | AAA | Lc 95.1 | Preferred for body text |
| #333F47 text on black | 1.94:1 | Fails | Lc -7.6 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D4DADE
oklch(88.5% 0.009 236.6)
-
Step 300
300
#B8C2CA
oklch(80.9% 0.016 241.8)
-
Step 400
400
#93A3AF
oklch(70.7% 0.025 240.2)
-
Step 500
500
#788D9B
oklch(63.2% 0.032 237.2)
-
Step 600
600
#607786
oklch(55.6% 0.036 236.9)
-
Step 700
700
#506471
oklch(49.2% 0.032 236.8)
-
Step 800
800
#41515C
oklch(42.6% 0.027 238.3)
-
Step 900
900 (this color)
#333F47
oklch(36% 0.021 237.4)
-
Step 950
950
#20282C
oklch(27.1% 0.014 229.5)
#333F47 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #3B3F47 | 0.012 |
| Deuteranopia (no green cones) | #393C47 | 0.013 |
| Tritanopia (no blue cones) | #2D4142 | 0.015 |
| Achromatopsia (no color) | #3D3D3D | 0.021 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333F47
#333F47
oklch(36% 0.021 237.4)
- #463B32
#463B32
oklch(36.1% 0.022 61.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #333F47, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.017
- Charcoal Grey #3C4142 ΔE 0.019
- Charcoal #264653 ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.036
- Gunmetal #293241 ΔE 0.047
- Midnight Green #073B4C ΔE 0.049
- Dark Slate Gray #2F4F4F ΔE 0.050
Use #333F47 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.